Piston pump with transverse thread actuator



Jan. 1967 H. A. SCHUDALLA, SR, ETAL 3,

PISTON PUMP WITH TRANSVERSE THREAD ACTUATOR Filed July 20, l964 2 Sheets-Sheet 1 Maw/0w. HEW/P) AA/DfifWJCf/UDAZA 4, 5/2 HEMP) r4/Y0P4W Jaw/0,4414, JAZ

Jan. 24, 1967 H. A. SCHUDALLA, SR. ETAL 3,299,720

PISTON PUMP WITH TRANSVERSE THREAD ACTUATOR Filed July 20, 1964 2 Sheets-Sheet 2 l/f/vram HEN/9y ANDREW Jaw/041m, 5A2 HENRY AWQQEW 50/0041 1 4, (/0.

14770A /VEK United States Patent 3,299,720 PISTON PUMP WITH TRANSVERSE THREAD ACTUATOR Henry Andrew Schudalia, SE. and Henry Andrew Schudalla, in, Shreveport, La., assignors, by mesne assignments, to Mid-Continent Steel Casting Corporation, a corporation of Louisiana Filed July 20, 1964, Ser. No. 383,756 11 Claims. (CI. 7457) This invention relates to improvements in pumping mechanism of the type wherein rotary motion is converted into rectilinear motion for the reciprocal operation of a piston.

The principal object of this invention is to provide an improved pump of the above class which is particularly eflicient for use as a mud pump.

Among several other objects to this end it is sought to provide an improved pump wit-h a transverse thread actuator that:

Requires fewer parts than many like pumps with the result that costs of manufacture are materially reduced,

Requires a minimum of space for installation and can be mounted in any desired position,

Is simplified in construct-ion and yet is highly eflicient for its intended purpose, and

Is capable of developing a large amount of p.s.i. with a minimum torque input.

Further objects and the more obvious advantages of the invention will be mentioned or else appear plainly from the description which follows.

This invention consists of novel parts and combination of parts to be hereinafter described whereby the objects set forth are attained, as pointed out in the claims, and illustrated in the accompanying drawings, in which:

FIG. 1 is a perspective view showing a preferred embodiment of this new pump,

FIG. 2 is an enlarged sectional view taken on the line 2-2 of FIG. 1,

FIG. 3 is a cross sectional view taken on the line 33 of FIG. 2, and

FIG. 4 is an enlarged exploded perspective view of this pump to more clearly illustrate the construction thereof.

Referring to the drawings, an elongated cylindrical housing 10 includes a drive end 11 which terminates in the flange 12 and a working end 13 which terminates in the flange 14. Housing 10 is provided intermediate flanges 12 and 14 with the slot 16 over which there is mounted the removable cover or cap 18 by any suitable means such as the screws 20. Slidably journalled within housing 10 is the cylindrical working sleeve or driven member 22 having a closed end 24 relative to flange 14 and open at the opposite end 26. Vent holes 28 are provided in end 24 to prevent formation of any vacuum as will become apparent. On the outer side of the end 24 suitable bearing means 30 are provided for attachment of a piston rod 32 which slidably extends through and is supported by the flange cap 34 that is secured to flange 14 as by the bolts 36. Such rod 32 will be attached to a piston (not shown) for driving the same in any suitable manner. Cap 34 is counterbored for a grease seal 38 that will contain a lubricant for housing 10 and such housing is provided with three spaced longitudinal grooves or flukes 40 (FIG. 3) on its internal wall to provide a passageway for such lubricant.

A rotatable drive member in the form of the gear rod 42 is disposed within housing 10 and includes end 44 that is journalled in end 26 of sleeve 22 for support, an intermediate section provided with a transverse thread 46 and a drive end 48 that is rotatably journalled in a flange cap 50 which is secured to flange 12 as by bolts 52. Cap 50 is counter-bored for a grease seal 54 similar to cap 34 and in relation to the drive end 48 of rod 42, housing 10 is "ice counter-bored to support a spherical roller bearing assembly 56 that is mounted on rod 42 and is contained in 'place by a suitable snap ring 58. A gasket means 60 may be provided between flanges 12 and 50 in a well known manner.

An opening 62 (FIG. 4) is provided in sleeve 22 which can be made to register with slot 16 in housing whereby it will also register with the transverse threads 46 as best seen in FIG. 2, and a two pronged cam follower 64 having a head portion '66 has its pronged portion passed through slot 16 and opening 62 to partially embrace rod 46 at its transverse thread portion 46. Cap portion 66 is slidable in slot 16 within the limits thereof and also serves to keep sleeve 22 from rotating. In this regard, it will be understood of course that'cover 18 is removed for insertion of follower 64 and then replaced to keep the follower thus contained.

In operation, any suitable source of power may be employed to rotate rod 42 by attachment to rod end 48 and as rod 42 is thus rotated about its longitudinal axis, follower 64 will follow the threads 46 and thus transfer the force from a rotary motion to a rectilinear motion by pushing sleeve 22 which correspondingly pushes the piston rod 32. The length of threads 46 may be predetermined end as the follower 64 reaches one end, it will follow the threads for a return travel so as to provide the usual reciprocating movement of piston rod 32.

While no invention is claimed per se in the use of a rod with transverse threads, it is pointed out that the present structure represents a material improvement over present pumps utilizing this principle because of the minimum number of parts required, the high degree of efliciency obtained and the low cost of manufacture obtainable. Consequently, from the foregoing description'it is thought a full understanding of the construction and operation of this invention will be had and that the advantages of the same will be appreciated.

It will be understood that the phraseology employed herein is for the purpose of description and not for limitation and that modifications and changes in the construction and arrangement of this invention can be made within the scope of what is claimed, without departing from the spirit and purpose thereof. It is thus intended to cover by the claims, any modified forms of structure or mechanical equivalents which may be reasonably included within their scope.

We claim:

1. A piston pump mechanism for converting rotary motion into reciprocating motion, comprising:

a cylindrical housing having a drive end and a working end,

removable flange caps for each end of said housing,

said housing provided with a slot intermediate said ends,

a removable cover over said slot,

a sleeve slidably journalled in said housing,

a piston rod carried by said sleeve and slidably extended through the cap on said working end,

said sleeve having an opening adapted to register with said slot,

a drive rod in said housing having one end rotatably journalled in said sleeve and the other end extended through the cap on said drive end for attachment to a source of power to impart a rotary motion thereto about its longitudinal axis,

transverse threads on said drive rod within said housing,

a cam follower disposed through said slot and said opening for tracking engagement with said transverse threads,

at head on said cam fol-lower engageable with and slidable in said slot and adapted to impart reciprocal 3 motion to said sleeve upon rotation of said drive rod; and said cam follower also serving to prevent rotary motion of said sleeve. 2. A piston pump mechanism for converting rotary motion into reciprocating motion, comprising:

a cylindrical housing having a drive end and a working end,

said housing being provided with a slot intermediate said ends,

a sleeve s'lidably journalled in said housing,

said sleeve having an opening adapted to register with said slot,

a piston rod carried by said sleeve so as to project from said working end,

support means on said working end for said piston rod,

a drive rod in said housing having one end rotatably journalled in said sleeve and the other end projecting from said drive end for attachment to a source of power,

support means on said drive end for said drive rod,

transverse threads on said drive rod within said housing,

cam follower means disposed through said slot and said opening for traclcable engagement with said transverse threads,

said cam follower means being engaged with said sleeve to impart reciprocal motion thereto upon rotation of said drive rod, and

means on said housing to prevent displacement of said cam follower means from said slot and opening.

3. A piston pump mechanism for converting rotary motion into reciprocating motion, comprising:

a slotted housing,

an apertured sleeve slidable in said housing,

a piston rod carried at one end of said sleeve,

a drive rod with transverse threads rotatably disposed at one end in the other end of said sleeve and the other end of said drive rod designed for attachment to a source of power, and

means slidable in said slot through said aperture and operably engageable with said transverse threads and said sleeve to impart a reciprocal motion to said sleeve upon rotation of said drive rod.

4. A piston pump mechanism for converting rotary motion into reciprocating motion, comprising:

a slotted housing,

an apertured sleeve slidable in said housing,

a piston rod carried at one end of said sleeve,

a drive rod with transverse threads rotatably disposed at one end in the other end of said sleeve and the other end of said drive rod designed for attachment to a source of power, and

cam follower means slidable in said slot through said aperture and extending transversely into said sleeve for tracking engagement with said transverse threads to impart a reciprocal motion to said sleeve upon rotation of said drive rod,

5. A device :as defined in claim 4 where said cam follower means includes spaced prongs for partially embracing said drive rod and a head portion slidable in said slot and enga-geable with said sleeve for reciprocating the same.

6. A device as defined in claim 4 wherein said cam follower means serves to prevent rotary motion of said sleeve.

7. A device as defined in claim 4 including means carried by said housing to prevent accidental displacement of said cam follower means from said slot and aperture.

8. A piston pump mechanism for converting rotary motion into reciprocating motion, comprising:

a slotted housing,

a reciprocating driven member in said housing,

a piston rod carried by said driven member,

a rotating dri've member with longitudinally extending transverse threads disposed at one end in said driven member and the other end of said driven member adapted for attachment to a source of power, and

means slidable in said slot and operably engageable with said transverse threads and said driven member to impart a reciprocal motion thereto upon rotation of said drive member.

9. A piston pump mechanism for converting rotary motion into reciprocating motion, comprising:

a slotted housing,

an apertured reciprocating driven member in said housa piston rod carried by said driven member,

a rotating drive member with longitudinally extending transverse threads dispose-d at one end in said driven member and the other end of said driven member :adapted for attachment to a source of power, and

cam follower means slidable in said slot through said aperture and extending transversely into said driven member for tracking engagement with said transverse threads to impart a reciprocal motion to said driven member upon rotation of said drive member.

10. A device as defined in claim. 9 wherein said cam follower means serves to prevent rotary motion of said driven member.

11. A device as defined in claim 9 including means carried by said housing to prevent accidental displacement of said cam follower means from said slot and aperture.

References Cited by the Examiner UNITED STATES PATENTS 1,723,100 8/1929 Voorhees 7457 1,723,189 8/1929 Martin 745'7 1,801,017 4/1931 Major 74-57 X 2,673,964 3/1954 Morton et a1. 7457 X 3,218,937 11/1965 Dettlof 74-57 X FRED C. MATTERN, JR., Primary Examiner, F. E. BAKER, Assistant Examiner, 

1. A PISTON PUMP MECHANISM FOR CONVERTING ROTARY MOTION INTO RECIPROCATING MOTION, COMPRISING: A CYLINDRICAL HOUSING HAVING A DRIVE END AND A WORKING END, REMOVABLE FLANGE CAPS FOR EACH END OF SAID HOUSING, SAID HOUSING PROVIDED WITH A SLOT INTERMEDIATE SAID ENDS, A REMOVABLE COVER OVER SAID SLOT, A SLEEVE SLIDABLY JOURNALLED IN SAID HOUSING, A PISTON ROD CARRIED BY SAID SLEEVE AND SLIDABLY EXTENDED THROUGH THE CAP ON SAID WORKING END, SAID SLEEVE HAVING AN OPENING ADAPTED TO REGISTER WITH SAID SLOT, A DRIVE ROD IN SAID HOUSING HAVING ONE END ROTATABLY JOURNALLED IN SAID SLEEVE AND THE OTHER END EXTENDED THROUGH THE CAP ON SAID DRIVE END FOR ATTACHMENT TO A SOURCE OF POWER TO IMPART A ROTARY MOTION THERETO ABOUT ITS LONGITUDINAL AXIS, TRANSVERSE THREADS ON SAID DRIVE ROD WITHIN SAID HOUSING, A CAM FOLLOWER DISPOSED THROUGH SAID SLOT AND SAID OPENING FOR TRACKING ENGAGEMENT WITH SAID TRANSVERSE THREADS, A HEAD ON SAID CAM FOLLOWER ENGAGEABLE WITH AND SLIDABLE IN SAID SLOT AND ADAPTED TO IMPART RECIPROCAL MOTION TO SAID SLEEVE UPON ROTATION OF SAID DRIVE ROD; AND SAID CAM FOLLOWER ALSO SERVING TO PREVENT ROTARY MOTION OF SAID SLEEVE. 